Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.47317

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 47, 365–370 (2007)

INTEGRAL EVALUATION OF ²³⁹Pu AND ²⁴⁰Pu MASSES IN THE CHERNOBYL FALLOUT ON THE TERRITORY OF BELARUS
E.A. Rudak, A.M. Elmansury, and O.I. Yachnik
B.I. Stepanov Institute of Physics, National Academy of Science of Belarus, F. Skaryna 68, 220072 Minsk, Belarus
E-mail: a.tulubtsov@dragon.bas-net.by

Received 8 May 2007; revised 3 July 2007

The activity ratio of the -radioactive fission fragments such as ⁹⁵Zr, ^103,106Ru, ^141,144Ce for the evaluation of the total α-activity of ²³⁹Pu + ²⁴⁰Pu isotopes in the soil of Gomel and Mogilev regions of Belarus is presented. We have taken into account a possible fluctuation of these ratios around their average values. Experimental data for several settlements in Gomel and Mogilev regions were also analysed, and a good correlation between theoretical evaluation and experimental data was obtained.

Keywords: radionuclide, isotope activity ratio, fission fragments, ^239,240Pu, activity and mass evaluation

PACS: 28.41.Te, 28.50.Hw, 89.60.-k, 02.50.-r

²³⁹Pu IR ²⁴⁰Pu MASIŲ KOMPLEKSINIS ĮVERTINIMAS ČERNOBYLIO AE AVARIJOS IŠKRITOSE BALTARUSIJOJE
E.A. Rudak, A.M. Elmansury, O.I. Yachnik
Baltarusijos nacionalinės mokslų akademijos B.I. Stepanovo Fizikos institutas, Minskas, Baltarusija

RBMK-1000 reaktoriaus branduolinio kuro izotopinės sudėties bei tik jam būdingų skilimo produktų aktyvumų santykių duomenys taikyti radionuklidų, patekusių po Černobylio AE avarijos į dirvožemį Gomelio ir Mogiliovo rajonuose (Baltarusija), sudėties analizei. ²³⁹Pu + ²⁴⁰Pu suminio aktyvumo įvertinimui buvo naudoti gama skilimo produktų, tokių kaip ⁹⁵Zr, ¹⁰³Ru, ¹⁰⁶Ru, ¹⁴¹Ce ir ¹⁴⁴Ce, aktyvumų santykiai. Dėl galimų santykių fliuktuacijų naudotos vidutinės jų vertės. Gauta, kad plutonis Černobylio AE avarijos metu pagrindinai iškrito aerozolių pavidalu, analogiškai kaip ¹⁰³Ru, ¹⁰⁶Ru ir 137Cs, vykstant sublimacijai ant submikroninių inertinių dalelių, kai plutonis buvo tarpinėje dujinėje fazėje, vykstant branduolinio kuro karbonizacijai. Todėl Baltarusijos teritorijos savivala nuo transuraninių elementų alfa spinduolių turėtų vykti greičiau nei tuo atveju, jei plutonis būtų iškritęs branduolinio kuro matricos sudėtyje. ²⁴¹Pu, pagrindinis ¹⁴¹Am atsiradimo šaltinis, iškritęs aerozolių pavidalu, dirvoje difunduos gilyn taip pat greičiau.

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